I'm not sure if my hair is 3b/3c because the picture for 3b has looser curls than what I have
the curls are not as tight as the picture for 3c but tighter than the 3b picture.
you shouldn't worry about your curl type so much. it's more important for you to care for it properly. my tumblr has great info in helping you how to care for your hair. regular trims are also very important.